Buggy code:
public class SQLCommander { public static final String TAG = SQLCommander . class . getName ( ) ; public static final String INITIAL_REF_INDEX = "0" ; public static final int DIRECTION_FORWARD = + 1 ; public static final int DIRECTION_BACKWARD = - 1 ; public static User queryUser ( Long userId ) { } public static User queryUserByEmail ( String email ) { } public static long registerUser ( User user ) { } public static Long createActivity ( String title , String content , Long userId ) { } public static boolean updateActivity ( Activity activity ) { } public static Activity queryActivity ( long activityId ) { } public static ActivityDetail queryActivityDetail ( Long activityId ) { } public static List < Activity > queryActivities ( Integer page_st , Integer page_ed , String orderKey , String orientation , Integer numItems , Long vieweeId , List < Integer > maskedRelationList ) { List < Activity > ret = new ArrayList < > ( ) ; try { EasyPreparedStatementBuilder builder = new EasyPreparedStatementBuilder ( ) ; String [ ] names = Activity . QUERY_FIELDS ; String [ ] onCols = new String [ ] { UserActivityRelation . USER_ID , UserActivityRelation . ACTIVITY_ID , UserActivityRelation . RELATION } ; String [ ] onOps = new String [ ] { "=" , "=" , "IN" } ; <START_BUG> Object [ ] onVals = new Object [ ] { vieweeId , ( ( Activity . TABLE ) + "." ) + ( Activity . ID ) , maskedRelationList } ; <END_BUG> List < JSONObject > activityJsonList = builder . select ( names ) . from ( TABLE ) . join ( UserActivityRelation . TABLE , onCols , onOps , onVals ) . order ( orderKey , orientation ) . limit ( ( ( page_st - 1 ) * numItems ) , ( page_ed * numItems ) ) . execSelect ( ) ; if ( activityJsonList == null ) return null ; for ( JSONObject activityJson : activityJsonList ) { User host = SQLCommander . queryUser ( Converter . toLong ( activityJson . get ( HOST_ID ) ) ) ; ret . add ( new Activity ( activityJson , host ) ) ; } } catch ( Exception e ) { Loggy . e ( SQLCommander . TAG , "queryActivities" , e ) ; } return ret ; } public static List < Activity > queryActivitiesWithUnmaskedRelation ( Integer page_st , Integer page_ed , String orderKey , String orientation , Integer numItems , Long vieweeId , int relation ) { } public static List < Activity > queryActivities ( String refIndex , String orderKey , String orientation , Integer numItems , Integer direction , int status ) { } public static List < Activity > queryActivities ( Integer page_st , Integer page_ed , String orderKey , String orientation , Integer numItems , int status ) { } public static List < Activity > queryHostedActivities ( Long hostId , Long viewerId , String refIndex , String orderKey , String orientation , Integer numItems , Integer direction ) { } public static List < Activity > queryHostedActivities ( Long hostId , Long viewerId , Integer page_st , Integer page_ed , String orderKey , String orientation , Integer numItems ) { } public static int queryUserActivityRelation ( Long userId , Long activityId ) { } public static List < Integer > queryUserActivityRelations ( List < Long > userIdList , Long activityId ) { } public static Comment queryComment ( Integer commentId ) { } public static List < Comment > queryTopLevelComments ( Long activityId , String refIndex , String orderKey , String orientation , Integer numItems , Integer direction ) { } public static List < Comment > queryTopLevelComments ( Long activityId , Integer page_st , Integer page_ed , String orderKey , String orientation , Integer numItems ) { } public static List < Comment > querySubComments ( Long parentId , String refIndex , String orderKey , String orientation , Integer numItems , Integer direction ) { } public static List < Comment > querySubComments ( Long parentId , Integer page_st , Integer page_ed , String orderKey , String orientation , Integer numItems ) { } public static Assessment queryAssessment ( Integer activityId , Integer from , Integer to ) { } public static List < Assessment > queryAssessments ( String refIndex , String orderKey , String orientation , Integer numItems , Integer direction , Long from , Long to , Long activityId ) { } public static boolean updateAssessment ( Integer activityId , Integer from , Integer to , String content ) { } public static void createAssessments ( List < Assessment > assessmentList ) { } public static List < Notification > queryNotifications ( Long to , Integer isRead , Integer page_st , Integer page_ed , String orderKey , String orientation , Integer numItems ) { } public static boolean validateOwnership ( long userId , long activityId ) { } public static boolean validateOwnership ( long userId , Activity activity ) { } public static boolean isActivityEditable ( Long userId , Long activityId ) throws AccessDeniedException , ActivityNotFoundException , InvalidActivityStatusException , UserNotFoundException { } public static boolean isActivityEditable ( Long userId , Activity activity ) throws AccessDeniedException , ActivityNotFoundException , InvalidActivityStatusException , UserNotFoundException { } public static boolean isActivityJoinable ( Long userId , int activityId ) throws ActivityNotFoundException , DeadlineHasPassedException , InvalidActivityStatusException , InvalidUserActivityRelationException , UserNotFoundException { } public static boolean isActivityJoinable ( User user , Activity activity ) throws ActivityNotFoundException , DeadlineHasPassedException , InvalidActivityStatusException , InvalidUserActivityRelationException , UserNotFoundException { } public static boolean isActivityJoinable ( Long userId , Activity activity ) throws ActivityNotFoundException , DeadlineHasPassedException , InvalidActivityStatusException , InvalidUserActivityRelationException , UserNotFoundException { } public static boolean isActivityCommentable ( Long from , Long activityId ) throws ActivityHasNotBegunException , ActivityNotAcceptedException , ActivityNotFoundException , UserNotFoundException { } public static boolean isActivityCommentable ( Long from , Activity activity ) throws ActivityHasNotBegunException , ActivityNotAcceptedException , ActivityNotFoundException , UserNotFoundException { }

Fix:
Object [ ] onVals = new Object [ ] { vieweeId , new EasyPreparedStatementBuilder . PrimaryTableField ( Activity . ID ) , maskedRelationList } ;